Tool-retainer for percussive hammers.



' vide a tool of this class in which the steel CHARLES CHRISTIANSEN, OF GELSENKIRCHEN, GERMANY TOOL-RETAINER FORv PERCUSSIVE I` IAMMERS.

Speciieation of Letters Patent.

Patented Mal. 21,1916.

i Application led July 7, 1915. Serial No. 38,402.

To all z't may concern.' Y

Be it-known that I, CHARLES CHiiis'riA'N- SEN, a subject\of the King of Prussia, residing-at' Gelsenkirchen, in theA Kingdom ofA rPrussia, German Empire, have invented certain new-and u ul Improvements inTool- Retainers for Percussive= IIa'rnmers;` and I dofhe'reby declare the' following to' bea full, clear, and exa to which it appertains to make and use the reference marked of thisspecification. My invent'on rel tes to improvements iii rock drills'and `the' like,and more particularly in rock drills, inwhi'ch the stem of the drill steelisv connected with the cylinder' or body-of the tool by means of a retainer in theff'orm of a'coiled spring secured at one end to the cylinder or body and embracing at its opposite end the steel and tending to hold the same in position andassisting in retracting the same from the borehole in case the steel should'stick therein.

, lThe object of the improvements is to proand spring can readily bey attached'to the body of the tool. j'

With this and other Aobjects iii/view my invention consists in the matters to be del scribed hereinafter and particularly pointed i attached `been used in all the views to indicate correspending parts. Y

In said drawing-Figure 1, is a side view of the spring used as a steel retainer, Fig. 2,

is a simiar plan view showing the spring o the tool and holding the steel in position, Fig. 3, is a perspective view show- -ing the rocking*clamping member of the spring which embraces the stem 'of' the'steel,

and Fig. 4, .is-'a similar peif's'pe'cftiveV View showing the spring and its eycsprovided for' attaching therocking clamping member.

In'the example shown in the drawing the body or cylinder h of the tool, which may be `a pneumatic tool, is formed Tat its outer end with screw-threads which are engaged by the coils of a coiled spring a. The latter 1s description' of the invention', :suchlas will enable 'ther's'slcill'ed the artformed at its outer end with two eyes and b located diametrically opposite each other, one of the said eyes being formed by forming the spring at one siderin the'form of a circular loop b and the4 'other' eye being formed b bending lthe endof the wire into circular orm, as is best shown in the per- -spectiveview shown in Fig. 4. The said eyes `'provide a pivotal support for a bail by means of which the steel c is held in position. As shown t'he said bail consists of-an outer part c' which is substantially in the form of the letter U, two branches c2 which are bent at acute angles from the branches of the part c', and outwardly rojecting arms which provide` the pivots or the bail and are in- 'serted in the eyes L and L of the springy as is shown in Figs. 1 and 2; `When thus ab tached to the spring a, the bail provides a means for retaining the steel e on the cylin der of the tool, which steel is formed with a flange orcollar f provided for engagement with the U-shaped part c. of the bail.' v In the practical use of the tool, the spring is screwed onto the cylinder and into the siti'on shown in Fig. 2. 'Thereupon the' ail c', c2., c is rocked into the position shown in Fig. l, whereupon the steel can be inserted through the springr and into the cylinder. After the steel has thus been brought into position, the bail. is rocked into l the position shown in F.ig. 2 in which. it engages the lsteiel ,Above the flange f. In a similar way the svg'fring'can be attached to the cylinder .wheg/ the drill'steel is in position as may be ne ssary for retreating the steel from the bore hole when using the drill with the spring removed.

In the preferred form of the bail shown in Fig. 3 the U-shaped part is narrower at the ends g of the branches c", So that it is spread apart' when rocking the same into en gageinent with the stein of tlf steel and is thereafter clamped together by springl action and loosely embraces the stem so as to permit-.free play `of the steel. Thereby the 1 bailgisV locked iny engagement with thel 'steel and aiil'notfbe rockedinto the inoperative fpositidnshownlin Fig-1 bythe percussions caused by the operation of the dr'il.

I claim herein as my invention: l 1. In a rockl drill, the combination with the bod'y of the tool, and the drill steel guided Within said body, of a coiled spring concentrically secured to said-rbody, and e i io rocking member on said spring adapted to f Abe rocked into and outof locking?r iigiigenient iiA ith the drill steel.

In :i rock drill,.tlie combination with the body of the tooL and' the drill Steel' guided within said body and liiiving ii Hang), of a coiled spring coiiicenti-iciill;Y 5ociired to said bodyg-:if rocking biiil. on said springzidiiptd to be rocked into :ind ont of locking and retracting'engagenivnt with the drill tool and ilts flange.v

3. In :i rock drill, the combination withI the body of theV tool, :ind lthe-drill steel guided within said body and havingr :i

Harige, of :i coiledfspriiigr concentriciilly ,sef giiidod by sziid liodyr. yofzififi the body of the' tool. ziiid'tl-iei drill stool gnidvd ii'itliiii siiid body. of :i coiled spring;v

A''i'oiicviitiiczill" vciii'cdftl'iSuid body, :uid :i 25

'lm-kingT liziil on sziid spring: adapted to be 

